const c = @cImport({
        @cInclude("stdio.h");
        @cInclude("sys/types.h");
        @cInclude("sys/socket.h");
        @cInclude("arpa/inet.h");
        @cInclude("netinet/in.h");
        @cInclude("string.h");
        @cInclude("stdio.h");
        @cInclude("unistd.h");
        @cInclude("pthread.h");
        @cInclude("semaphore.h");
        @cInclude("libnetfilter_queue/libnetfilter_queue.h");
});

const std = @import("std");
const ChildProcess = std.os.ChildProcess;
const warn = std.debug.warn;

pub fn main() void {
    const h = c.nfq_open();

	// ~/Downloads/zig-linux-x86_64-0.2.0.b65203f5/zig  build-exe zf.zig --library c  --library netfilter_queue
    // /home/juturnas/Desktop/zigfilter/zf.zig:45:16: error: cast discards const qualifier
    const cb = @ptrCast(?[*]extern fn(?*c.nfq_q_handle, ?[*]c.nfgenmsg, ?*c.nfq_data, ?*c_void) c_int, callback);

    const queue_handle = c.nfq_create_queue(h, 0, cb, null);

    if (queue_handle == null) {
         warn("nfq_create_queue() failed");
        return;
    }
}

extern fn callback(qh: ?*c.nfq_q_handle, nfmsg: ?[*]c.nfgenmsg, nfa: ?*c.nfq_data, data: ?*c_void) c_int {
    return 0;
}